(5/6x + 7/8x)*42 = 82
(20/24x + 21/24x)*42 = 82
41/24х * 42 = 82
41/24х = 82/42
х = 82/42 : 41/24
х = 82/42 * 24/41
х = 8/7 = 1 1/7
(5/6x + 7/8x)*42 = 82
(20/24x + 21/24x)*42 = 82
41/24х * 42 = 82
41/24х = 82/42
х = 82/42 : 41/24
х = 82/42 * 24/41
х = 8/7 = 1 1/7